Chapter 5: Vocabulary Words Nutrition: The process by which the body takes in and uses food. Calories: The units of heat that measure the energy used by the body and the energy that foods supply to the body. Nutrients: The substances in food that your body needs to grow, to repair itself, and to supply you with energy. Hunger: A naural physical drive that protects you from starvation. Appetite: A desire, rather than a need, to eat. Carbohydrates: The starches and sugars present in foods. Fiber: An indigestible complex carbohydrate that is found in the tough, stringy parts of vegetables, fruits and whole grains. Proteins: Nutrients that help build and maintain body cells and tissues. Lipid: A fatty substance that does not dissolve in water. Vitamins: Compounds that help regulate many vital body processes, including the digestion, absorption, and metabolism of other nutrients. Minerals: Substances that the body cannot manufacture but that are needed for forming healthy bones and teeth and for regulation many vital body processes. Dietary Guidelines for Americans: A set of recommendations for healthful eating and active living. Food Guide Pyramid: A guide for making healthful daily food choices.